package com.dzh.littlebearu.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.dzh.littlebearu.common.CustomException;
import com.dzh.littlebearu.dto.DishDto;
import com.dzh.littlebearu.entity.Dish;
import com.dzh.littlebearu.entity.DishFlavor;
import com.dzh.littlebearu.mapper.DishMapper;
import com.dzh.littlebearu.service.DishFlavorService;
import com.dzh.littlebearu.service.DishService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Slf4j
@Service
public class DishServiceImpl extends ServiceImpl<DishMapper, Dish> implements DishService {

    @Autowired
    private DishFlavorService dishFlavorService;

    /**
     * 新增菜品，同时保存对应的口味数据
     * @param dishDto
     */
    @Override
    @Transactional//因为同时操作了两张表，所以需要加事务
    public void saveWithFlavor(DishDto dishDto) {
        //保存菜品的基本信息到菜品表dish
        this.save(dishDto);

        Long dishId = dishDto.getId();//菜品id
        List<DishFlavor> flavors = dishDto.getFlavors();//菜品口味

        flavors = flavors.stream().map((item) -> {
            item.setDishId(dishId);
            return item;
        }).collect(Collectors.toList());

        //保存菜品口味数据到菜品口味表dish_flavor
        dishFlavorService.saveBatch(flavors);
    }

    /**
     * 根据id查询菜品信息和对应的口味信息
     * @param id
     * @return
     */
    @Override
    public DishDto getByIdWithFlavor(Long id) {
        //查询菜品的基本信息，从dish表查询
        Dish dish = this.getById(id);

        DishDto dishDto = new DishDto();
        BeanUtils.copyProperties(dish,dishDto);

        //查询当前菜品对应的口味信息，从dish_flavor表查询
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(DishFlavor::getDishId,dish.getId());
        List<DishFlavor> flavors = dishFlavorService.list(queryWrapper);
        dishDto.setFlavors(flavors);

        return dishDto;
    }

    @Override
    @Transactional
    public void updateWithFlavor(DishDto dishDto) {
        //更新dish表基本信息
        this.updateById(dishDto);

        //先清理当前菜品对应口味数据---dish_flavor表的delete操作
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(DishFlavor::getDishId,dishDto.getId());

        dishFlavorService.remove(queryWrapper);

        //添加当前提交过来的口味数据---dish_flavor表额insert操作
        List<DishFlavor> flavors = dishDto.getFlavors();

        flavors = flavors.stream().map((item) -> {
            item.setDishId(dishDto.getId());
            return item;
        }).collect(Collectors.toList());

        dishFlavorService.saveBatch(flavors);
    }

    /**
     * 根据id删除菜品，删除菜品之前要进行判断
     * @param ids
     */
    @Override
    public void remove(List<Long> ids) {
        //查询菜品的状态，判断是否可以删除
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();

        queryWrapper.in(Dish::getId,ids);
        queryWrapper.eq(Dish::getStatus,1);

        int count = this.count(queryWrapper);

        if(count > 0){
            throw new CustomException("菜品正在售卖中，不能删除");
        }

        //如果可以删除，先删除菜品表中的数据--dish
        this.removeByIds(ids);

        //再删除口味表的数据--dish_flavor
        LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper = new LambdaQueryWrapper<>();

        lambdaQueryWrapper.eq(DishFlavor::getDishId,ids);

        dishFlavorService.remove(lambdaQueryWrapper);
    }

    /**
     * 根据菜品id，修改菜品售卖状态
     * @param status
     * @param ids
     */
    @Override
    public void modifyStatus(int status, List<Long> ids) {
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        Dish dish = null;
        int size = ids.size();
        while(size > 0){
            Long id = ids.get(size - 1);
            dish = this.getById(id);
            dish.setStatus(status);
            queryWrapper.eq(Dish::getId,id);
            this.updateById(dish);
            size--;
        }
    }
}
